xref: /freebsd/usr.sbin/pw/pwupd.c (revision 1c05a6ea6b849ff95e539c31adea887c644a6a01)
1 /*-
2  * Copyright (C) 1996
3  *	David L. Nugent.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #ifndef lint
28 static const char rcsid[] =
29   "$FreeBSD$";
30 #endif /* not lint */
31 
32 #include <sys/wait.h>
33 
34 #include <err.h>
35 #include <errno.h>
36 #include <pwd.h>
37 #include <libutil.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 
43 #include "pwupd.h"
44 
45 char *
46 getpwpath(char const * file)
47 {
48 	static char pathbuf[MAXPATHLEN];
49 
50 	snprintf(pathbuf, sizeof pathbuf, "%s/%s", conf.etcpath, file);
51 
52 	return (pathbuf);
53 }
54 
55 static int
56 pwdb_check(void)
57 {
58 	int             i = 0;
59 	pid_t           pid;
60 	char           *args[10];
61 
62 	args[i++] = _PATH_PWD_MKDB;
63 	args[i++] = "-C";
64 
65 	if (strcmp(conf.etcpath, _PATH_PWD) != 0) {
66 		args[i++] = "-d";
67 		args[i++] = conf.etcpath;
68 	}
69 	args[i++] = getpwpath(_MASTERPASSWD);
70 	args[i] = NULL;
71 
72 	if ((pid = fork()) == -1)	/* Error (errno set) */
73 		i = errno;
74 	else if (pid == 0) {	/* Child */
75 		execv(args[0], args);
76 		_exit(1);
77 	} else {		/* Parent */
78 		waitpid(pid, &i, 0);
79 		if (WEXITSTATUS(i))
80 			i = EIO;
81 	}
82 
83 	return (i);
84 }
85 
86 static int
87 pw_update(struct passwd * pwd, char const * user)
88 {
89 	struct passwd	*pw = NULL;
90 	struct passwd	*old_pw = NULL;
91 	int		 rc, pfd, tfd;
92 
93 	if ((rc = pwdb_check()) != 0)
94 		return (rc);
95 
96 	if (pwd != NULL)
97 		pw = pw_dup(pwd);
98 
99 	if (user != NULL)
100 		old_pw = GETPWNAM(user);
101 
102 	if (pw_init(conf.etcpath, NULL))
103 		err(1, "pw_init()");
104 	if ((pfd = pw_lock()) == -1) {
105 		pw_fini();
106 		err(1, "pw_lock()");
107 	}
108 	if ((tfd = pw_tmp(-1)) == -1) {
109 		pw_fini();
110 		err(1, "pw_tmp()");
111 	}
112 	if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
113 		pw_fini();
114 		close(tfd);
115 		err(1, "pw_copy()");
116 	}
117 	fsync(tfd);
118 	close(tfd);
119 	/*
120 	 * in case of deletion of a user, the whole database
121 	 * needs to be regenerated
122 	 */
123 	if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
124 		pw_fini();
125 		err(1, "pw_mkdb()");
126 	}
127 	free(pw);
128 	pw_fini();
129 
130 	return (0);
131 }
132 
133 int
134 addpwent(struct passwd * pwd)
135 {
136 
137 	return (pw_update(pwd, NULL));
138 }
139 
140 int
141 chgpwent(char const * login, struct passwd * pwd)
142 {
143 
144 	return (pw_update(pwd, login));
145 }
146 
147 int
148 delpwent(struct passwd * pwd)
149 {
150 
151 	return (pw_update(NULL, pwd->pw_name));
152 }
153